1 /*
2  * Copyright (C) 2011 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_RUNTIME_OFFSETS_H_
18 #define ART_RUNTIME_OFFSETS_H_
19 
20 #include <iostream>  // NOLINT
21 #include "globals.h"
22 
23 namespace art {
24 
25 // Allow the meaning of offsets to be strongly typed.
26 class Offset {
27  public:
Offset(size_t val)28   explicit Offset(size_t val) : val_(val) {}
Int32Value()29   int32_t Int32Value() const {
30     return static_cast<int32_t>(val_);
31   }
Uint32Value()32   uint32_t Uint32Value() const {
33     return static_cast<uint32_t>(val_);
34   }
SizeValue()35   size_t SizeValue() const {
36     return val_;
37   }
38 
39  protected:
40   size_t val_;
41 };
42 std::ostream& operator<<(std::ostream& os, const Offset& offs);
43 
44 // Offsets relative to the current frame.
45 class FrameOffset : public Offset {
46  public:
FrameOffset(size_t val)47   explicit FrameOffset(size_t val) : Offset(val) {}
48   bool operator>(FrameOffset other) const { return val_ > other.val_; }
49   bool operator<(FrameOffset other) const { return val_ < other.val_; }
50 };
51 
52 // Offsets relative to the current running thread.
53 template<size_t pointer_size>
54 class ThreadOffset : public Offset {
55  public:
ThreadOffset(size_t val)56   explicit ThreadOffset(size_t val) : Offset(val) {}
57 };
58 
59 // Offsets relative to an object.
60 class MemberOffset : public Offset {
61  public:
MemberOffset(size_t val)62   explicit MemberOffset(size_t val) : Offset(val) {}
63 };
64 
65 }  // namespace art
66 
67 #endif  // ART_RUNTIME_OFFSETS_H_
68